In the dark criminal world of Seoul, U-min, Cheol-jung, Do-wan and Yeong-hwan are close friends in a gang. One day, with the help of an older member Gang-seop, U-min, Cheol-jung and Do-wan attack the gang's casino so they can start new lives. But their plan goes awry when Cheol-jung betrays them, and U-min goes to prison. He becomes the scapegoat to save his friends' lives.